Under Armour Men's ColdGear Infrared Lightweight T-Shirt 100% Polyester Imported ColdGear Infrared technology uses a soft, thermo-conductive inner coating to absorb & retain your own body heat Two-tone, textured fabric is lightweight & incredibly breathable Material wicks sweat & dries really fast Anti-odor technology prevents the growth of odor-causing microbes Ergonomically shaped cuffs